So I turned off some pred and prey types just to improve my luck a bit (not necessary just slightly reduces the number of attempts needed) And got a score I calculated at about 12.6 million points in a Chef Campaign.

There is definitely room for improvement here. But it doesn't actually let me see my score. It just says one under 10 million. Even though I had a pred eat 26 prey that were 483,000 something points each.

Just tried again. This time I managed to get a much better run. There are 26 of these guys. My actual score this run is over 
103,069,876 but it still just says 9,999,999.

Yeah, there is a score cap to avoid the number to become a negative number due to overflowing, it's just that until this update no one ever reached it.

Wild results you got here! I maaay need to rebalance a couple of cards to not utterly trivilize endless mode, but congrats on your well deserve 10.000.000+ score